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Fem Modeling Of Plastic Flow And Strain-Induced Phase Transformation In Bn Under High Pressure And Large Shear In A Rotational Diamond Anvil Cell, Biao Feng, Valery I. Levitas, Wanghui Li Jan 2018

Fem Modeling Of Plastic Flow And Strain-Induced Phase Transformation In Bn Under High Pressure And Large Shear In A Rotational Diamond Anvil Cell, Biao Feng, Valery I. Levitas, Wanghui Li

Aerospace Engineering Publications

Combined three-dimensional plastic flow and strain-induced phase transformation (PT) in boron nitride (BN) under high pressure and large shear in a rotational diamond anvil cell (rotational DAC or RDAC) are investigated. Geometrically nonlinear frameworks including finite elastic, transformational, and plastic deformations and finite element method (FEM) are utilized. Quantitative information is obtained on the evolutions of the stress tensor, plastic strain, volume fraction of phases in the entire sample, and slip-cohesion transitions, all during torsion under a fixed compressive load in RDAC. The effects of the applied compressive stress and the sample radius on PT and plastic flow are discussed ...